Fix [for] crash if loop var is unset

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 5 insertions, 1 deletions

diff --git a/jim.c b/jim.c
index 5943eb8..78b4db2 100644
--- a/jim.c
+++ b/jim.c
@@ -10743,9 +10743,13 @@ static int Jim_ForCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv
                     goto evalnext;
                 }
 
-                objPtr = Jim_GetVariable(interp, varNamePtr, JIM_NONE);
+                objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG);
 
                 /* Increment */
+                if (objPtr == NULL) {
+                    retval = JIM_ERR;
+                    goto out;
+                }
                 if (!Jim_IsShared(objPtr) && objPtr->typePtr == &intObjType) {
                     currentVal = ++objPtr->internalRep.wideValue;
                     Jim_InvalidateStringRep(objPtr);